Device and method for transferring cotton fiber, and device for removing impurity in cotton fiber

ABSTRACT

A device for transferring a cotton fiber includes a cotton-fiber support plate, a first cover plate, a saw blade roller, a licker-in roller, and a second cover plate. A spacing between the saw blade roller and the licker-in roller and an arc of the saw blade roller covered by the second cover plate are adjusted such that the number of rotations required for transferring the cotton fiber is N. A device for removing an impurity in a cotton fiber is also provided by further adding an impurity-removing plate and an air compensation port to the above transferring device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is continuation of International Patent Application No. PCT/CN2020/119174, filed on Sep. 30, 2020, which claims the benefit of priority from Chinese Patent Application Nos. 201911022232.6 and 201921806459.5, both filed on Oct. 25, 2019. The content of the aforementioned applications, including any intervening amendments thereto, is incorporated herein by reference in its entirety.

TECHNICAL FIELD

This application relates to mechanisms for primary processing of cotton, and more particularly to a device and a method for transferring a cotton fiber, and a device for removing an impurity in the cotton fiber.

BACKGROUND

Currently, saw ginning devices and saw delinting devices are main devices for primary processing of cotton, and their functions are described as follows.

For example, Chinese patent No. 203668559U discloses a saw ginning device including a saw blade roller and a brush roller. The saw blade roller pulls the cotton fiber to pass through a rib gap between to filter the cotton seed, and then the cotton fiber on the saw blade roller is brushed off by the brush roller and transported out of the saw ginning machine. The surface of the cotton seed processed by the ginning machine is still attached with dense linters, which account for about 6.7% by weight of the lint and are an important fiber source. At present, ginning factories usually carry out the mechanical delintion using a saw delinting device, such as a double-layer saw delinting device disclosed by Chinese patent No. 2009819000. The double-layer saw delinting device includes a saw blade roller and a brush roller. The linters on the cotton seed is delinted through the saw blade roller in a working box, and then the linters on the saw blade roller are brushed off and transported out of the device through the brush roller.

As shown in FIG. 1, in the existing saw ginning device or saw delinting device, a spacer ring is arranged between adjacent saw blades of a saw blade roller. A thickness of the spacer ring is 7-20 mm, and a radius of the spacer ring is about 80 mm smaller than that of the saw blade. A thickness of the saw blade is 0.95 mm. A rib is arranged between the adjacent saw blades, and a distance between the rib and the adjacent saw blade is about 1 mm. The saw blade hooks the cotton fiber to pass through a rib gap, and the cotton fiber is transferred to a brush roller from the saw blade roller. It should be noted that the cotton fiber needs to be totally transferred to the licker-in roller, whereas the cotton fiber remaining on the saw blade roller will move to a working box with the rotation of the saw blade roller, and may float to the ground below the working box or back to the working box, which would cause some problems. For example, after working for a long time, the lower part of the ribs may be blocked by those cotton fibers, leading to abnormal working of the device and even causing a fire due to the longtime friction between the blocked cotton fiber and the saw blade. In addition, the cotton fiber floating to the ground under the working box brings the loss of cotton fiber and environmental pollution. Furthermore, the cotton fiber returned to the working box is pulled by the saw blade again, which causes neps and ropes, and affects the quality of the cotton fiber.

Since the friction coefficient between the brush and the cotton fiber is 0.35-0.4, which is close to the friction coefficient 0.3 between the saw blade and the cotton fiber, and thus a saw blade roller 700 and a brush roller 100 are arranged in a contact brushing manner. A brush 101 of the saw blade roller extends into the brush roller by 1-3 mm to facilitate the separation and transfer of the cotton fiber on the licker-in roller. However, the brush forcibly separates the cotton fiber on the saw blade, and the impurities that have been exposed on the saw blade roller will be recombined with the cotton fiber, which makes it difficult to separate the impurities from the cotton fiber. In addition, a distance between adjacent rolls of brushes is about 30 mm, which may cause the instantaneous accumulation of the cotton fiber in the gap between the brushes during the high-speed transfer process of the cotton fiber, hindering the separation of impurities. In the contact brushing manner, to avoid the fire caused by friction, the saw blade roller used herein almost has no gripping force on the cotton fiber and only provides a centrifugal force, leading to a low removing rate of the impurity. The discharged impurities are easy to carry effective fibers, causing loss of clothing fiber. In addition, the service time of the brush is short due to the longtime friction.

Currently, the non-contact brushing manner has not been used for transferring cotton fiber from the roller with the toothed brush.

The existing saw ginning device and saw delinting device may have the following problems.

1. The efficiency for removing impurities is low, leading to a cost for adding an impurity-removing device. The cotton fiber processed by the existing saw ginning device and saw delinting device fails to meet the requirements of downstream users. According to the technical requirement GB/T19819-2005 of the saw ginning device and the technical requirement GB/T21306-2007 of the saw delinting device, a clear standard for the removing rate of the impurity in the cotton fiber is not put forward in the main performance of the device, which means the impurity-removing performance of the existing saw ginning device and saw delinting device is undesirable. To satisfied the downstream users, the lint processed by the existing saw ginning device needs to be further processed by a special lint cleaning device, such as GB/T 21208-2007; and the linters processed by the saw delinting device also need to be further processed a special linters cleaning device, such as GH/T1023-2000. Those cleaning devices largely increase the cost, such as the purchase cost, installation coast and maintaining cost.

2. The existing saw ginning device and saw delinting device may cause large noise and serious air pollution, and require a dust-removing device. The saw ginning device and saw delinting device both include a saw blade roller and a rush roller. The brush roller is an important part in these devices, and is mainly configured to brush the processed cotton fiber and transfer out the cotton fiber from the devices. Generally, a rotation speed of the brush roller is larger than 1000 rpm to totally clean and transfer the cotton fiber from the saw blade roller. However, air flow caused by the high-speed rotation of the brush roller will lead to severely friction with the surrounding mechanical components, generating a large noise. According to the technical requirement GB/T19819-2005 of the saw ginning device and the technical requirement GB/T21306-2007 of the saw delinting device, a no-load noise of the saw ginning device should not be greater than 90 dB(A) and a no-load noise of the saw delinting device should not be greater than 85 dB(A)”. In addition, the high-speed rotation of the brush roller will blow up the dust on the cotton fiber. The brush roller sucks in a large amount of clean air, but discharges similarly sized dust-containing gas, causing serious air pollution. Therefore, an additional facility such as dust-removing pipeline, dust-removing fan and dust-removing tower with a processing capacity of about 6000 m³/h is required for each saw ginning device and saw delinting device, resulting in the increase in the construction cost and energy consumption of the production line.

Therefore, the existing saw ginning device and saw delinting device that include a saw blade roller and a brush roller face the problems of low impurity-removing efficiency, large noise pollution and air pollution, and need to be improved.

SUMMARY

To solve the large noise pollution and air pollution caused by the saw ginning device and saw delinting device mentioned above, the present disclosure provides a device and a method for transferring a cotton fiber, and a device for removing an impurity in the cotton fiber. The brush roller mentioned above is replaced by a licker-in roller, and the contact brushing manner is changed to a non-contact brushing manner to reduce the abrasion of the roller, so as to effectively remove the impurity and reduce the noise pollution and air pollution.

The technical solutions of the present disclosure are described as follows.

In a first aspect, the present disclosure provides a device for transferring a cotton fiber, comprising:

-   -   a saw blade roller;     -   a licker-in roller;     -   an arc-shaped cotton-fiber support plate;     -   a first cover plate;     -   a guide plate;     -   a windscreen plate; and     -   two box plates arranged oppositely;     -   wherein the two box plates are respectively arranged at two ends         of the licker-in roller and the saw blade roller; the first         cover plate and the cotton-fiber support plate are arranged         between the two box plates from top to bottom; a cylindrical         cavity is enclosed by the cotton-fiber support plate and the         first cover plate of the licker-in roller; an arc surface of the         cylindrical cavity is provided with a first window and a second         window arranged oppositely; the first window is communicated         with an exit channel enclosed by the guide plate and the         windscreen plate between the two box plates; the licker-in         roller is arranged in the cylindrical cavity along an axial         direction of the cylindrical cavity; an axis of the saw blade         roller is parallel to an axis of the licker-in roller; the         second window faces away from the exit channel; a gap between a         surface of the saw blade roller and the licker-in roller is not         greater than 5 mm; preferably 0.5-1 mm; a cotton fiber is         capable of rotating with the saw blade roller to form a         cotton-fiber floating layer; a linear speed of the licker-in         roller is greater than a linear speed of the saw blade roller;         and a rotation direction of the saw blade roller is opposite to         a rotation direction of the licker-in roller to allow the cotton         fiber to be transferred from the saw blade roller to the         licker-in roller.

In a preferred embodiment, the saw blade roller is provided with a plurality of saw blades, an outer circumference of the plurality of saw blades is provided with teeth; two opposite side walls of the plurality of saw blades are respectively provided with a rib; the saw blade roller is configured to hook and pull the cotton fiber from between the ribs to form an initial floating layer with a thickness of L_(m)× sin t, wherein L_(m) is a length of the cotton fiber; ti is an angle between the cotton fiber and a tangent of the saw blade roller at an intersection of the hooked cotton fiber and the saw blade roller; t=θ=40±4°; θ is an angle between an entrance side of the teeth of the saw blade roller and a normal plane of the teeth passing a top of the teeth.

In a preferred embodiment, a licker-in wire layer is evenly wound on an outer circumference of the licker-in roller; a gap between the first cover plate and the licker-in wire layer is no larger than 5 mm, preferably 0.2 to 3 mm; and a gap between the windscreen plate and the licker-in wire layer is no larger than 5 mm, preferably 0.2 to 3 mm.

In a preferred embodiment, an end of the first cover plate close to the saw blade roller is a starting end; and a distance from the starting end to the saw blade roller is larger than a thickness of the initial floating layer; a distance from the starting end to a line between a center of the saw blade roller and a center of the licker-in roller is larger than half of a length S of a common chord of a virtual circumference of the initial floating layer and a circumference of the licker-in roller; a ratio of the linear speed of the licker-in roller to the linear speed of the saw blade roller is no less than

$\frac{S}{S - {2ɛL_{m}}};$

ε is an inclination coefficient of the cotton fiber; and ε is selected from 0.8-1.

In a preferred embodiment, an arc M of the surface of the saw blade roller between the rib of the saw blade roller and an end of the first cover plate close to the saw blade roller is 42°-180°.

In a preferred embodiment, the saw blade roller is provided with a plurality of second cover plates spaced apart; an end of each of the plurality of second cover plates is connected to the first cover plate; an arc M of the surface of the saw blade roller covered by each of the plurality of second cover plates is 42-180°; a distance between an end of each of the plurality of second cover plates close to the first cover plate and the surface of the saw blade roller is larger than 21 mm; and a distance between an end of each of the plurality of second cover plates away from the first cover plate and the surface of the saw blade roller is 3-10 mm.

In an embodiment, the number N of rotations of the cotton fiber rotating with the saw blade roller under the plurality of second cover plates is larger than (M)/(2Πr_(j)), wherein r_(j) is a radius of the saw blade roller; a thickness B of the cotton-fiber floating layer is calculated according to a critical diameter formula of a cyclone separator as follows:

${B = {\frac{d_{c}^{2}{\prod{(M)2{\prod{r_{j}w\rho_{s}}}}}}{2{\prod\;{r_{j}*9\mu}}} = \frac{d_{c}^{2}{\prod{(M)w\rho_{s}}}}{9\mu}}};$

wherein w is a rotating speed of the saw blade roller, d_(c) is a diameter of the cotton fiber, ρ_(s) is a proportion of the cotton fiber in the cotton-fiber floating layer; and μ is a fluid viscosity of the air; and Π is Pi.

In an embodiment, a length S of a chord of the licker-in roller intersecting with the initial floating layer or the cotton-fiber floating layer under of the plurality of second cover plates is calculated as follows:

${S = {2\sqrt{R_{c}^{2} - \left( \frac{R_{c}^{2} - \left( {r_{j} + B} \right)^{2} + \left( {r_{j} + R_{c} + x} \right)}{2\left( {r_{j} + R_{c} + x} \right)} \right)^{2}}}};$

in which B is the thickness of the initial cotton-fiber floating layer; R_(c) is a radius of the licker-in roller; r_(j) is a radius of the saw blade roller; and x is the distance between the surface of the barbed roller and the saw blade roller.

In a second aspect, device for removing an impurity in a cotton-fiber, comprising

-   -   the above-mentioned device for transferring a cotton fiber; and     -   an impurity-removing plate;     -   wherein the impurity-removing plate is arranged on a side of the         cotton-fiber support plate close to the saw blade roller; the         impurity-removing plate is detachably connected to the two box         plates; the licker-in roller is capable of rotating with respect         to the first cover plate to form a low pressure zone on a side         of the plurality of second cover plates, so as to reduce an air         resistance to the cotton fiber when the cotton fiber rotates         centrifugally with the saw blade roller in the low pressure         zone.

In an embodiment, the cotton-fiber support plate is provided with an air compensation port.

In an embodiment, an angle between a line connecting an end of the impurity-removing plate close to the saw blade roller to a center of the licker-in roller and a line connecting the center of the licker-in roller to a center of the saw blade roller is 20-60°; and a distance between an upper end of the impurity-removing plate and the licker-in roller is 15-45 mm.

In a third aspect, the present disclosure provides a method for transferring a cotton fiber using the device for transferring a cotton fiber, comprising:

-   -   rotating the saw blade roller carrying a cotton fiber with an         impurity for N circles to form a cotton-fiber floating layer         with a thickness of B;     -   rotating the licker-in roller to remove the impurity of the         cotton fiber in the cotton-fiber floating layer hooked by the         licker-in wire layer or the teeth through an impurity-removing         plate; and     -   discharging the impurity and a residual cotton fiber through an         exit channel; in which a cotton-brushing area with a length of S         is formed on the licker-in roller intersecting with the         cotton-fiber floating layer; the ratio of the linear speed of         the licker-in roller to the linear speed of the saw blade roller         is no less than

$\frac{S}{S - {2ɛL_{m}}};$

L_(m) is a length of the cotton fiber; S is larger than 2εL_(m); ε is the inclination coefficient of cotton fiber; and ε is 0.8-1.

A mechanism for transferring a cotton fiber using the device provided herein is described as follows.

Internal reference materials show that the seed cotton moves with teeth towards a rib, and immediately changes the direction and speed of movement when hitting the rib. The seed cotton then moves upwards along a surface of the rib. The speed of the seed cotton at the working point of the seed cotton roll is the slowest, and is about 1.1-1.5 m/s. When the seed cotton is at the working point of the rib, the moment that the teeth pulls the fiber from the cotton seed, a running force Fp of a saw blade can be decomposed into two mutually perpendicular forces Fr and Ft. A direction of the Fp is consistent with a traveling direction of the teeth at a working point, and is perpendicular to a radial direction of the saw blade. The Fr is perpendicular to the rib, and is a force for the teeth at a working point of the rib to pull out a cotton fiber from the cotton seed. A direction of the Ft is parallel to the rib, and is a force for the teeth at the working point of the rib to drive a roll of the seed cotton to run. An angle between a tangent of the rib 702 at the working point and a tangent (Fp direction) of the saw blade 701 is a pressure angle. The pressure angle increases when the teeth 7011 pass through the working point of the rib 702, which reducing an effect on the roll of the seed cotton to run upwards along a tangent function of the rib 702. Since the roll of the seed cotton runs upwards along the tangent direction of the rib, an angle σ between the cotton fiber and a normal plane of the teeth 7011 passing through a top of the teeth 7011 is less than 90°, and a maximum value of an angle δ between the cotton fiber and an entrance side 70111 of a tooth is 90°. Referring to FIGS. 7 and 8, the entrance side of the teeth is a side of the teeth close to the licker-in roller. Specifically, as shown in FIG. 7, a right side of each tooth of the teeth is the entrance side of the corresponding tooth.

The saw blade roller is installed with saw blades with a centripetal angle, the teeth are provided on the circumference of the saw blade. The angle between the entrance side of the teeth and the normal plane passing the top of the teeth is θ=40°±4°, so that the maximum value of the included angle between the cotton fiber and the circumferential tangent of the saw blade is θ, that is, when the speed of the saw blade roller is extremely low or the side of the saw blade roller close to the barbed roller is a relatively negative pressure zone, when the cotton fiber rotates with the saw blade without facing air resistance, the fiber remains in the state when it is completely pulled off from the rib, σ=90°−θ, the thickness of the cotton-fiber floating layer is L_(m)×sin θ=13.51-20.84 mm, and L_(m) is the length of the cotton fiber, with a value of 23-30 mm.

Since the distance x between the saw blade roller and the licker-in roller is preferably 0.5 mm, the virtual circle of the cotton-fiber floating layers formed on the saw blade roller intersects with the circumference of the licker-in roller and shares the chord length S, that is, the cotton brushing area. The thickness B of the cotton-fiber floating layer and the radius R_(c) of the licker-in roller are variables. According to the two circles with known radius and center distance, find the chord length S shared by the two circles. The radius R_(c) of the licker-in roller is 125-310.5 mm.

R_(c)² − z₁² = (r_(j) + B)² − z₂²z₁ + z₂ = r_(j) + R_(c) + x $S = {2\sqrt{R_{c}^{2} - \left( \frac{R_{c}^{2} - \left( {r_{j} + B} \right)^{2} + \left( {r_{j} + R_{c} + x} \right)}{2\left( {r_{j} + R_{c} + x} \right)} \right)^{2}}}$

Z₁ and Z₂ are divided by the chord shared by the two circles, the length of each section connecting the centers of the two circles, and x is the surface distance between the saw blade roller and the licker-in roller.

The cotton fiber leaves the rib with the saw blade roller. When the linear speed of the saw blade roller is lower than 1.5 m/s, the thickness B of the cotton-fiber floating layer is 13.51-20.84 mm; when the linear speed of the saw blade roller exceeds the speed of 1.5 m/s, the cotton fiber is also subject to wind resistance, and the centrifugal force exerted by the saw blade roller on the cotton fiber.

The thickness of the cotton-fiber floating layer theoretically formed under the action of centrifugal force when the cotton fiber rotates with the saw blade roller at a high speed in the present disclosure:

According to the critical diameter formula of the cyclone separator,

${d_{c} = \sqrt{\frac{9*\mu*B}{\prod{*N*u_{i}*\rho_{s}}}}},$

the cotton fiber is equivalent to the separated particles, the diameter of a cotton fiber is d_(c)=15 μm, the average length of the cotton fiber is 28 mm, and the volume of the cotton fiber: 3.14*0.015 mm*0.015 mm*28=0.019782 mm³, the specific gravity of cotton fiber ρ_(s) is 1.5 g/cm³, μ=0.0186 mPa*s at 30° C., the number of rotations N of the cotton fiber on the surface of the saw blade roller is greater than (M)/(2Πr_(j), the radius of the saw blade roller is r_(j), w is the speed of the saw blade roller, u_(i) is the tangential speed of particles and gas in the cyclone separator, which is equivalent to the linear speed of the cotton fiber as it rotates with the saw blade roller, u_(i)=2Πr_(j)w, B is the maximum thickness of the airflow through the particle settling process, which is equivalent to the thickness of the cotton-fiber floating layer,

${B = {\frac{d_{c}^{2}{\prod{(M)2{\prod{r_{j}w\rho_{s}}}}}}{2{\prod\;{r_{j}*9\mu}}} = \frac{d_{c}^{2}{\prod{(M)w\rho_{s}}}}{9\mu}}}.$

According to the installation experience, the arc from the rib of the saw blade roller to the second cover plate of the licker-in roller is 42°-180°, and the diameter of the existing saw blade roller is 320 mm. N>(M)/(2Πr_(j)), assuming that the cotton fiber is initially attached to the surface of the saw blade roller, the thickness B of the cotton-fiber floating layer produced when the saw blade roller rotates is shown in Table 1. The distance between the end of the second cover plate of the licker-in roller close to the saw blade roller and the surface of the saw blade roller is greater than the thickness B of the cotton-fiber floating layers.

TABLE 1 The distribution of the thickness B of the floating layer on the surface of the saw blade roller at different speeds of the saw blade roller The thickness of the floating layer (mm) 2° 42° 52° 58° 62° 72° 92° 102° 112° 122° 142° 152° w = 200 rpm 0.12 2.47 3.06 3.42 3.65 4.24 5.42 6.01 6.60 7.19 8.36 8.95 w = 350 rpm 0.18 3.71 4.59 5.12 5.48 6.36 8.13 9.01 9.89 10.78 12.55 13.43 w = 390 rpm 0.23 4.82 5.97 6.66 7.12 8.27 10.57 11.71 12.86 14.01 16.31 17.46 w = 400 rpm 0.24 4.95 6.13 5.98 7.30 8.48 10.84 12.02 13.19 14.37 16.73 17.91 w = 500 rpm 0.29 6.18 7.66 6.83 9.13 10.60 13.55 15.02 16.49 17.96 20.91 22.38 w = 600 rpm 0.35 7.42 9.19 8.54 10.96 12.72 16.26 18.02 19.79 21.56 25.09 26.86 w = 650 rpm 0.38 8.04 9.95 10.25 11.87 13.78 17.61 19.52 21.44 23.35 27.18 29.10 w = 700 rpm 0.41 8.66 10.72 11.96 12.78 14.84 18.97 21.03 23.09 25.15 29.27 31.33 w = 780 rpm 0.46 9.65 11.94 13.32 14.24 16.54 21.13 23.43 25.73 28.02 32.62 34.91

The centrifugal force exerted by the rotation of the saw blade roller on the cotton fiber offsets the resistance of the cotton fiber to the wind. The higher the speed, the longer the number of rotations, the more significant the offsetting effect. At the same time, laminar flow is formed on the surface of the licker-in roller when it rotates, and the distance between the second cover plate of the licker-in roller and the licker-in roller is extremely small, the laminar flow from the seed cotton fiber outlet channel is extremely small, when the licker-in roller rotates, downward airflow is generated below the intersection of the licker-in roller and the saw blade roller, so that the brush surface area above the intersection of the licker-in roller and the saw blade roller forms a low pressure zone or relative to the negative pressure zone, the resistance of the cotton fiber to the wind is further reduced, and the cotton fiber floating layer can maintain the thickness of the floating layer of the barbed roller when pulled off from the rib. Especially when the saw blade roller is close to the side of the licker-in roller and the ribs cover the saw blade rear cover plate, a vacuum zone is formed under the saw blade rear cover plate, and the cotton fiber is not subject to air resistance.

The principle of transferring and conveying the cotton fiber from the saw blade roller by the licker-in roller of the device provided herein is described as follows.

The cotton fiber separated by the saw blade roller rotates with the saw blade roller to form a cotton-fiber floating layer, the intersection of the licker-in roller and the cotton-fiber floating layers forms a cotton-brushing area. When the cotton fiber rotates to the cotton brushing area, the linear speed of the licker-in roller is higher. The friction between the second layer and the cotton fiber is greater than the friction between the brush and the cotton fiber, and the cotton fiber is hooked and pulled straight by the licker-in wire layer on the surface of the licker-in roller in the cotton brushing area;

When the end of the cotton fiber away from the saw blade moves in the cotton brushing area for a time equal to or less than the time required for the hanging point of the cotton fiber and the saw blade to move with the saw blade to the arc length that passes when it leaves the saw blade, the linear speed ratio of the licker-in roller to the saw blade roller is enough to transfer all the cotton fibers on the saw blade to the licker-in roller, and without back cotton in this state. At the same time, it is required that the chord length S of the cotton brushing area corresponding to the licker-in roller is greater than twice the length of the cotton fiber. If S is less than 2L_(m), it means that when the cotton fiber leaves the saw blade roller, there is a non-negligible angle between the movement direction of the cotton fiber on the licker-in roller and the movement direction of the cotton fiber on the saw blade roller, causing the two ends of the cotton fiber are respectively hooked and pulled by the saw blade and the licker-in roller, causing difficulty in separation. Because the cotton fiber is not perpendicular to the center line of the saw blade roller and the barbed roller when it is just hooked by the licker-in roller during the transfer from the saw blade roller to the licker-in roller, and when it leaves the saw blade roller, the cotton fiber and the vertical line of the center line of the saw blade roller and the licker-in roller has an included angle φ, therefore, when the chord length S of the actual cotton brushing area corresponding to the licker-in roller is greater than twice the product of the cotton fiber length and the cotton fiber inclination coefficient c, the cotton fiber can still be completely transferred. Therefore, in the present disclosure, when S is greater than 2εL_(m), it means that the cotton fiber can be transferred. When ε is 0.8-1, εL_(m) represents L_(m) cos φ.

The chord S in the intersecting area of the circular cotton-fiber floating layer produced by the rotation of the saw blade roller and the licker-in roller is shown in Table 2. The chord length is approximately equal to the distance that the cotton fiber moves with the licker-in roller after being hooked by the licker-in roller.

TABLE 2 Chord (mm) The radius of the licker-in roller The thickness of the floating layer (mm) (mm) 0.6 5 6 6.59 7 8 9 9.13 10 11.96 13.51 14.24 14.84 16.53 20.84 125 0.00 49.83 55.22 58.21 60.14 64.69 68.94 69.48 72.95 80.24 85.58 87.98 89.90 95.12 107.30 160 0.00 53.29 59.08 62.29 64.36 69.26 73.84 74.42 78.16 86.04 91.81 94.42 96.51 102.21 115.46 180 0.00 54.87 60.84 64.15 66.29 71.34 76.07 76.66 80.54 88.67 94.65 97.34 99.50 105.41 119.15 200 0.00 56.24 62.36 65.75 67.95 73.14 78.00 78.61 82.58 90.95 97.09 99.86 102.09 108.17 122.33 203 0.00 56.43 62.57 65.98 68.18 73.39 78.26 78.88 82.87 91.26 97.43 100.21 102.44 108.55 122.77 220 0.00 57.43 63.69 67.16 69.41 74.71 79.68 80.30 84.37 92.93 99.22 102.06 104.34 110.57 125.10 240 0.00 58.48 64.86 68.40 70.69 76.09 81.16 81.80 85.95 94.68 101.10 103.99 106.32 112.69 127.53 260 0.00 59.42 65.90 69.50 71.83 77.33 82.48 83.13 87.35 96.23 102.76 105.71 108.08 114.56 129.68 310.5 0.00 61.38 68.09 71.80 74.21 79.90 85.23 85.90 90.27 99.48 106.24 109.30 116.45 123.47 134.18

When the value of s is 1, the ratio of the linear speed of the licker-in roller to the saw blade roller corresponding to the above chord length S is shown in Table 3.

TABLE 3 The ratio of the linear speed licker-in roller to the saw blade roller The radius of the licker-in roller The thickness of the floating layer (mm) (mm) 0.60 5.00 6.00 7.00 8.00 9.00 9.13 10.00 11.96 13.51 14.24 14.84 16.54 20.84 125 0.00 −8.08 −70.98 14.53 7.45 5.33 5.16 4.30 3.31 2.89 2.75 2.65 2.43 2.09 160 0.00 −19.67 19.18 7.70 5.22 4.14 4.04 3.53 2.86 2.56 2.46 2.38 2.21 1.94 180 0.00 −48.59 12.57 6.44 4.65 3.79 3.71 3.28 2.71 2.45 2.35 2.29 2.13 1.89 200 0.00 237.62 9.81 5.68 4.27 3.55 3.48 3.11 2.60 2.36 2.28 2.22 2.07 1.84 203 0.00 132.49 9.52 5.60 4.22 3.52 3.45 3.08 2.59 2.35 2.27 2.21 2.07 1.84 220 0.00 40.14 8.28 5.18 3.99 3.37 3.30 2.97 2.52 2.30 2.22 2.16 2.03 1.81 240 0.00 23.54 7.32 4.81 3.79 3.23 3.17 2.87 2.45 2.24 2.17 2.11 1.99 1.78 260 0.00 17.37 6.65 4.54 3.63 3.11 3.06 2.79 2.39 2.20 2.13 2.08 1.96 1.76 310.5 0.00 5.92 3.99 3.20 2.76 2.49 2.46 2.30 2.05 2.11 1.87 1.84 1.75 1.72

When the value of ε is 0.8, the ratio of the linear speed of the licker-in roller to the saw blade roller corresponding to the above chord length S is shown in Table 4.

TABLE 4 The ratio of the linear speed ratio of the licker-in roller to the saw blade roller The radius of the licker-in roller The thickness of the floating layer (mm) (mm) 0.60 5.00 6.00 6.59 7.00 8.00 9.00 9.13 10.00 11.96 13.51 14.24 14.84 20.84 125 9.91 5.30 4.34 3.92 3.25 2.86 2.82 2.59 2.26 2.10 2.04 1.99 1.72 160 0.00 6.28 4.14 3.56 3.29 2.83 2.54 2.51 2.34 2.09 1.95 1.90 1.87 1.63 180 0.00 5.45 3.79 3.32 3.08 2.69 2.43 2.41 2.25 2.02 1.90 1.85 1.82 1.60 200 0.00 4.92 3.55 3.14 2.93 2.58 2.35 2.33 2.19 1.97 1.86 1.81 1.78 1.58 203 0.00 4.85 3.52 3.12 2.92 2.57 2.34 2.31 2.18 1.96 1.85 1.81 1.78 1.57 220 0.00 4.55 3.37 3.00 2.82 2.50 2.28 2.26 2.13 1.93 1.82 1.78 1.75 1.56 240 0.00 4.27 3.23 2.90 2.73 2.43 2.23 2.21 2.09 1.90 1.80 1.76 1.73 1.54 260 0.00 4.06 3.12 2.81 2.66 2.38 2.19 2.17 2.05 1.87 1.77 1.74 1.71 1.53 310.5 0.00 3.70 2.92 2.66 2.52 2.28 2.11 2.09 1.99 1.82 1.73 1.69 1.67 1.50

Preferably, the diameter d_(c) of the saw blade roller is 320 mm, the rotating speed of the saw blade roller is greater than 300 rpm, the arc M of the saw blade roller rotating with the cotton fiber is 92°-180°, and the radius of the licker-in roller R_(c) is greater than that of the saw blade roller, and when the thickness B of the cotton-fiber floating layer is greater than 13.54 mm, the licker-in roller and the saw blade roller are driven to rotate by the geared motor at a linear speed ratio of S:S−2εL_(m), in which L_(m) is a length of the cotton fiber; ε is an inclination coefficient of the cotton fiber; ε is 0.8-1; and S is a length of a common chord length of after the intersection of the cotton fiber floating layer and the licker-in roller corresponding to the licker-in roller, which is equal to

${S = {2\sqrt{R_{c}^{2} - \left( \frac{R_{c}^{2} - \left( {r_{j} + B} \right)^{2} + \left( {r_{j} + R_{c} + x} \right)}{2\left( {r_{j} + R_{c} + x} \right)} \right)^{2}}}},$

in which x is 0.6-1 mm.

The cotton fiber transferred to move with the licker-in roller, under the action of the rotating centrifugal force of the licker-in roller, leaves the licker-in roller, and is supported by the movable impurity-removing plate and the cotton-fiber support plate arranged at the lower part of the licker-in roller, and is blocked by the windscreen plate. The cotton fiber is ejected from the cotton fiber outlet through the machine body under the action of centrifugal force and centrifugal inertia force.

The technical scheme of the present disclosure realizes 100% transfer of cotton fibers on the saw blade roller to the licker-in roller for the first time. So that the non-contact ginning machine has the conditions for industrial application.

The principle of the device provided herein for reducing working noise and reducing working dust is described as follows.

The height of the licker-in wire layer is much smaller than the height of the brush, so that the air volume passing through the second cover plate of the licker-in roller when the licker-in roller rotates is much smaller than that of the brush roller, which greatly reduces the dust volume; and the airflow passing through the second cover plate of the licker-in roller is reduced, the airflow speed is reduced, so that the airflow speed is much lower than the surface linear speed of the licker-in roller, preventing the airflow from cutting the card wire to produce noise.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts a structure of an existing device for transferring a cotton fiber in a contact manner according to a comparative example;

FIG. 2 schematically depicts a structure of a device for removing an impurity in a cotton fiber based on a device for transferring a cotton fiber according to an embodiment of the present disclosure;

FIG. 3 schematically depicts a transfer process of a cotton fiber using the device for transferring the cotton fiber according to an embodiment of the present disclosure;

FIG. 4 schematically depicts a force exerted on the transferred cotton fiber in the device for transferring the cotton fiber according to an embodiment of the present disclosure;

FIG. 5 schematically depicts a transfer process of the cotton fiber using in the device for transferring the cotton fiber in the comparative example;

FIG. 6 schematically depicts a structure of the device for removing the impurity in the cotton fiber based on the device for transferring the cotton fiber according to an embodiment of the present disclosure;

FIG. 7 schematically depicts a force exerted on a seed-cotton roll by teeth of a saw blade roller at a working point of a rib in a reference report; and

FIG. 8 is a schematic diagram of an angle between the cotton fiber and a circumferential tangent line of the saw blade roller when the saw blade roller pulls the cotton fiber from a rib.

In the drawings, 100, brush roller; 101. brush; 110. brush bundle; 120. brush root; 130. cover plate; 102. shell;

200. licker-in roller; 401. impurity-removing plate; 402. second cover plate; 4021. starting end; 403. windscreen plate; 404. cotton-fiber support plate; 405. guide plate; 406. exit channel; 407. shell; 408. licker-in wire layer; 409. cover plate; 410. air compensation port; 411. cylindrical cavity; 412. first window; 413. second window; 414. cotton-brushing area; 415. box plate; 700. saw blade roller; 701. saw blade; 7011. teeth; 70111. entrance side; and 702. rib.

DETAILED DESCRIPTION OF EXAMPLES

The technical solutions of the prior art and the present disclosure will be further described below with reference to the accompanying drawing.

Referring to FIGS. 6-8, a cotton fiber transfer device is provided. Seed cotton moves with teeth 7011 towards a rib 702, and immediately changes the direction and speed of movement when hitting the rib 702. The seed cotton then moves upwards along a surface of the rib 702. A running force Fp of a saw blade 701 can be decomposed into two mutually perpendicular forces Fr and Ft. A direction of the Fp is consistent with a traveling direction of the teeth 7011 at a working point, and is perpendicular to a radial direction of the saw blade 701. The Fr is perpendicular to the rib, and is a force for the teeth 7011 at a working point of the rib 702 to pull out a cotton fiber from the cotton seed. A direction of the Ft is parallel to the rib 702, and is a force for the teeth 7011 at the working point of the rib 702 to drive a roll of the seed cotton to run. An angle between a tangent of the rib 702 at the working point and a tangent (Fp direction) of the saw blade 701 is a pressure angle. The pressure angle increases when the teeth 7011 pass through the working point of the rib 702, which reducing an effect on the roll of the seed cotton to run upwards along a tangent function of the rib 702. Since the roll of the seed cotton runs upwards along the tangent direction of the rib, an angle σ between the cotton fiber and a normal plane of the teeth 7011 passing through a top of the teeth 7011 is less than 90°, and a maximum value of an angle δ between the cotton fiber and an entrance side 70111 of a tooth is 90°. The entrance side 70111 of the tooth is a side of the tooth close to a licker-in roller 200. Specifically, as shown in FIG. 7, a right side of each tooth of the teeth 7011 is the entrance side 70111 of the corresponding tooth. Specifically, the seed cotton includes the cotton seed and cotton fiber.

In an embodiment, a saw blade roller 700 hooks out the cotton fiber from between ribs 702 to form an initial floating layer with a thickness of L_(m)×sin t, in which L_(m) is a length of the cotton fiber; t is an angle between the cotton fiber pulled out and a tangent of the saw blade roller 700 at an intersection of the cotton fiber and the saw blade roller 700; t=θ=40±4°; and θ is an angle between the entrance side 70111 of the tooth of the saw blade roller 700 and a normal plane of the teeth 7011 passing through the top of the teeth 7011. Specifically, when the saw blade roller 700 hooks out the cotton fiber of the seed cotton between the ribs 702 and the initial floating layer is just formed, the cotton fiber (the initial floating layer) is subjected to a centrifugal force when rotating with the saw blade roller 700, such that the thickness of the cotton fiber (the initial floating layer) gradually increases to form a cotton-fiber floating layer.

In an embodiment, the cotton fiber transfer device may be, but is not limited to, applied to a saw ginning machine, a saw delinting machine and a saw lint cleaner.

Comparative Example 1

As shown in FIG. 1, a saw blade roller 700 and a brush roller 100 in the prior art may be configured to constitute a saw ginning machine, a saw delinting machine and a saw lint cleaner. A diameter of a saw blade 701 of the saw blade roller 700 of the saw ginning machine is 320 mm, and the saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 500 rpm. The brush roller 100 includes a shell 102 and a brush 101. A diameter of the shell 102 is 310 mm. An outer circumference of the licker-in roller shell 102 is provided with twenty-six brushes 101 spaced apart. A height of the brush 101 is 50 mm, that is, a height of a brush bundle 110 is 25 mm and a height of a brush root 120 is 25 mm. A radius of the shell 102 is 155 mm, that is, when the brush roller 100 rotates, a rotating diameter is 410 mm. A thickness of a single brush bundle 110 is 10 mm, and a thickness of a single brush root 120 is 25 mm. The brush roller 100 has a length of 1400 mm and a rotation speed of 1010 rpm. A lower half of the brush roller 100 is wrapped by a cotton-fiber support plate 404.

As shown in FIG. 5, an end A of a cotton fiber is hooked on the saw blade 701. The cotton fiber moves centripetally along a tangential direction of the saw blade 701. The other end C of the cotton fiber is pulled by a force along a direction of the cotton fiber to follow the A end of the cotton fiber to rotate, such that the cotton fiber is pulled to be straight. A tensile force can be decomposed into a centripetal force F₁ pointing to a circle center O and a component force F₂ parallel to the arc tangent. The C end of the cotton fiber is also subjected to a centrifugal force F₃ and a resistance force in a direction opposite to the centrifugal force. As shown in FIG. 4, an angle between a line of the end C and the end A of the cotton fiber and a tangential direction of the saw blade 701 is β. When the cotton fiber rotates with the saw blade 701, a cotton-fiber floating layer is formed. The cotton-fiber floating layer is partially in contact with a surface of the brush roller 100, and the contact area on the brush roller 100 is a cotton-brushing area 414. An effective range of the brush bundle 110 is an arc of rotation when the brush bundle 110 is in contact with the saw blade roller 700. The brush 101 of the brush roller 100 extends 1 mm into the saw blade roller 700, and a chord length of the brushing area 414 corresponding to the saw blade roller 700 is 61.677 mm. A central angle Φ_(j) of the saw blade roller 700 corresponding to the effective range of the brush bundle 110 is 13.566°, and a central angle Φ_(m) of the brush roller 100 corresponding to the effective range of the brush bundle 110 is 11.464°. A center angle of the brush roller 100 Φ_(o) corresponding to the adjacent brush bundles 110 is 10.981°, calculating by the following equation: Φ_(o)=360°/26−2 arcsin(5/200)=10.981°. The cotton-brushing area 414 is a sum of the Φ_(o) and the Φ_(m). A displacement time of the saw blade 701 following the brush bundle 110 along the effective range of the brush bundle 110 is equal to a time that the brush bundle 110 moves in the cotton-brushing area 414, which is represented by the following equation: (Φ_(j)·D_(j))/v_(i)=(Φ_(o)+Φ_(m))·D_(m)/v_(m), in which v_(j) is a linear speed of the saw blade 710. A linear speed ratio I between the brush roller 100 to the saw blade roller 700 is calculated according to an experience formula: i≥(Φ_(o)+Φ_(m))·D_(m)/(Φ_(j)·D_(j))=2.068, so as to brush the cotton fiber cleanly. Therefore, a central angle of the brush roller 100 with the diameter of 410 mm corresponding to the cotton brushing area 414 is 22.445°.

An air quantity generated by the brush roller 100 per minute during working is calculated as follows:

Air quantity Q ₃ =V*S/T

in which, V is a volume of the brush roller 100 suffering from the air; S is a rotation speed; and T is a working time.

V = {a  contour  area  of  the  brush  roller  100-an  area  of  the  shell  102-an  area  of  twenty-six  brush  bundles   110  and  the  brush  roots  120}^(*)  the  length  of  brush  roller  100 = {3.14^(*)(0.155 + 0.025 + 0.025)m^(*)(0.155 + 0.025 + 0.025)m-3.14^(*)0.155m^(*)0.155m-[(0.025^(*)0.025) + (0.01^(*)0.025)]m^(2*)26}^(*)1.4m = 0.047278m³.Air  quantity  Q₃ = 0.047278m^(3*)1010/min  = 47.75m³/min  = 0.796m³/s.

Therefore, the air quantity generated by the brush roller 100 per hour is about 2865.05 m³. A gap between a windscreen plate 403 and a top of the brush of the brush roller 100 is generally required to be set at 3 mm. Then, an area of an upper air inlet of the brush roller 100 is only 0.0042 m², which is calculated by the equation: 1.4 m*0.003 m=0.0042 m²; and the air quantity generated by the brush roller 100 is 0.796 m³/s. Theoretically, a wind speed v₃ at the intersection should reach 0.796÷0.0042=189.4872 m/s, and a linear speed of the brush bundle 110 is 3.14*(0.155+0.025+0.025)*2*1010÷60=21.671 m/s. The linear speed of the brush bundle 110 is less than the airflow speed 189.4872 m/s required by an air inlet of a gap with a width of 1-3 mm between the brush bundle 110 and the windscreen plate 403. After being blocked by the rear windshield 403 and the brush bundle 110, the air flow vibrate the brush bundle 110 and the brush root 120 to generate noise, and the airflow forms a negative pressure or even a vacuum at a cover plate 130 of the brush. The huge air pressure difference and wind speed will inevitably cause violent friction with the windscreen plate 403 at the air inlet of the gap with the width of 1-3 mm, resulting in huge howling noise.

According to the Bernoulli equation, an equation can be obtained as follows:

P ₃ +ρgh+½ρv ₃ ² =P ₀ +ρgh+½ρv ₀ ².

In an embodiment, an impurity-removing plate 401 is provided on a side of the cotton-fiber support plate 404 close to the saw blade roller 700.

As shown in FIG. 1, P₃ is a pressure at a left end of the impurity-removing plate 401; P₀ is a pressure at the saw blade roller 700; and P₀ is the atmospheric pressure. The airflow generated by a rotating saw blade roller 700 is negligible. v₀ is 0 m/s. An air density ρ is 1.293 g/L. A first gap between the brush bundle 110 and the left end of the impurity-removing plate 401 is set to 20 mm, and the first gap between the brush bundle 110 and the left end of the impurity-removing plate 401 forms an air inlet. An area of the air inlet is 1.4 m*0.02 m=0.024 m². The air quantity generated by the brush bundle 110 is 0.796 m³/s. Theoretically, the wind speed v₃ at the air inlet between the left end of the impurity-removing plate 401 and the brush 110 bundle should reach 0.796÷0.024=33.16 m/s, which is greater than a linear speed of the brush bundle 110 of 27.786 m/s. A second gap between a right end of the impurity-removing plate 401 and the brush bundle 110 is 60 mm, and a wind speed at the second gap is one third of the wind speed at the first gap.

ΔP′=P₃−P₀=−½ρv₃ ²=−710.893 Pa. That is, and air pressure between the left end of the impurity-removing plate 401 and the brush bundle 110 is negative pressure, which is very different from the atmospheric pressure on a side of the saw blade roller 700. An air pressure difference generates a suction force to the cotton fiber towards a side of the channel between the impurity-removing plate 401 and the brush roller 100, such that the cotton fiber is sucked into the channel between the impurity-removing plate 401 and the brush roller 100. A wind speed in the channel between the impurity-removing plate 401 and the brush roller 100 is greater than the linear speed of the brush bundle 110. Impurities such as infertile seeds, leaf crumbs, cottonseed hulls, cottonseed covers on a surface of the brush roller 100 are sucked into the channel between the impurity-removing plate 401 and the brush roller 100 before being layered. The impurity-removing plate 401 can block the impurities with a larger particle size that the impurities larger than a width of the channel between the impurity-removing plate 401 and the brush roller 100 are blocked. Since the wind speed is greater than the linear speed of the brush bundle 110, the cotton fiber moves forwards faster than the brush bundle 110 and is blocked between the brushes 101 of two adjacent brush bundles 110. As a result, the holding power of the brush bundle 110 on the cotton fiber is further reduced, and the cotton fiber is also lost, reducing the clothing content, that is, a weight percent the cotton fiber in the seed cotton.

Embodiment 1

As shown in FIG. 2, a cotton fiber transfer device includes a saw blade roller 700, a licker-in roller 200, a cotton-fiber support plate 404, a first cover plate 402, a guide plate 405, a windscreen plate 403 and two box plates 415 arranged oppositely. The first cover plate 402 and the cotton-fiber support plate 404 are arranged between the two box plates 415 from top to bottom. A cylindrical cavity 411 is enclosed by the cotton-fiber support plate 404 and the first cover plate 402. An arc surface of the cylindrical cavity 411 is provided with a first window 412 and a second window 413 arranged oppositely. The first window 412 is communicated with an exit channel 406 enclosed by the guide plate 405 and the windscreen plate 403 between the two box plates 415. The licker-in roller 200 is arranged along an axis of the cylindrical cavity 411. The saw blade roller 700 is arranged in the second window 413, and an axis of the saw blade roller 700 is parallel to an axis of the licker-in roller 200. The second window 413 faces way from the exit channel 406.

As shown in FIG. 2, in an embodiment, a plurality of second cover plates 409 are arranged spaced apart on the saw blade roller 700. Specifically, a plurality of second cover plates 409 are arranged spaced apart on an upper half of the circumferential surface of the saw blade roller 700.

As shown in FIG. 2, a cotton-fiber impurity-removing device includes the cotton fiber transfer device and an impurity-removing plate 401. The impurity-removing plate 401 is arranged on a side of the cotton-fiber support plate 404 close to the saw blade roller 700, and the impurity-removing plate 401 and the two box plates 415 are detachable. The licker-in roller 200 can rotate with respect to the first cover plate 402 to form a low pressure zone on a side of the second cover plate 409, reducing an air resistance of the cotton fiber when the cotton fiber rotates centrifugally with the saw blade roller 700 in the low pressure zone.

As shown in FIG. 2 and FIG. 6, in an embodiment, the licker-in roller 200 and the saw blade roller 700 are arranged between the two side box plates 415 of the cotton-fiber impurity-removing device. A diameter of the licker-in roller 200 is larger than a diameter of the saw blade roller 700. An effective length of the licker-in roller 200 is greater than an effective length of the saw blade roller 700. The licker-in roller 200 and the saw blade roller 700 are arranged and driven according to the following manner. A cotton-brushing area 414 is formed between the licker-in roller 200 and the saw blade roller 700. The licker-in roller 200 and the saw blade roller 700 are axially parallel. A distance x between a surface of the licker-in roller 200 and a surface of the saw blade roller 700 is 0.6 mm. The licker-in roller 200 and the saw blade roller 700 are driven by a driving device to rotate. A rotating direction of the licker-in roller 200 is opposite to a rotating direction of the saw blade roller 700, and a linear speed of the licker-in roller 200 is greater than a linear speed of the saw blade roller 700, such that the cotton fiber rotates with the saw blade roller to form a cotton-fiber floating layer. The cotton-fiber floating layer is transferred through the rotation of the licker-in roller 200, and is finally thrown out along a tangential direction of the licker-in roller 200. The cotton-fiber support plate 404 and the first cover plate 402 are arranged in parallel between the two box plates 415 along an upper half and a lower half of a circumferential surface of a shell 407 of the licker-in roller 200, respectively. A plurality of second cover plates 409 are arranged spaced apart on the upper half of the circumferential surface of the saw blade roller 700. An end of the cotton-fiber support plate 404 and the first cover plate 402 away from the saw blade roller 700 are connected to the guide plate 405 and the windscreen plate 403, respectively. The guide plate 405, the windscreen plate 403 and the two box plates 415 enclose the exit channel 406. The exit channel 406 is parallel to a throwing direction. A vertical distance between an end of the first cover plate 402 and the cotton-brushing area 414 is 40-100 mm. A vertical distance from the second cover plate 402 to a surface of the saw blade roller 700 is greater than 21 mm. A left end of each second cover plate 409 is 3-10 mm away from the surface of the saw blade roller 700, and a right end of each third cover plate 409 is connected to the first cover plate 402. The other end of the cotton-fiber support plate 404 is detachably connected to the impurity-removing plate 401. The impurity-removing plate 401 is parallel to an outer surface of a lower half of the shell 407 of the licker-in roller 200. The connection line between the end of the impurity-removing plate 401 near the saw blade roller 700 and the center of the licker-in roller 200 is connected. An angle between a connection line of an end of the impurity-removing plate 401 close to the saw blade roller 700 and a circle center of the licker-in roller 200 and a center line of the saw blade roller 700 and the licker-in roller 200 is 40-60°, and an arc of the each third cover plate 409 covering a surface of the saw blade roller 700 is 62°.

As shown in FIG. 2, in an embodiment, a surface of the licker-in roller 200 is mounted by a licker-in wire layer 408 spaced apart along a circumference direction.

In an embodiment, the cotton fiber transfer device further includes the shell 407 of the licker-in roller 200. The shell 407 of the licker-in roller 200 covers the licker-in roller 200, and the licker-in wire layer 408 is evenly wound around on a surface the shell 407 along a circumference direction. The licker-in wire layer 408 includes a 109-type card wire and card clothing.

As shown in FIG. 7, in an embodiment, an outer circumference of a saw blade 701 of the saw blade roller 700 is provided with teeth 7011.

As shown in FIG. 2, the specific parameters are as follows. A diameter of the saw blade 701 of the saw blade roller 700 of a saw ginning machine is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 500 rpm. A spacer ring is arranged between adjacent saw blades 701 of the saw blade roller 700, and the thickness of the spacer ring is 18 mm. A thickness of the saw blade 701 is 0.95 mm. An interval between the adjacent saw blades 701 is 18 mm. Fifty-five saw blades 701 are provided in total. An effective length of the saw blade roller 700 is 55*0.95=52.25 mm, and a gap length is 1024.25−52.25=972 mm. A diameter of the spacer ring is 160 mm. The shortest distance from a surface of the spacer ring to a tooth tip of the saw blade 701 is 80 mm. The shell 407 of the licker-in roller 200 has a diameter of 400 mm and a working length of is 1400 mm. The licker-in wire layer 408 composed the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 203 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 1440 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A gap between a surface of the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A distance between the impurity-removing plate 401 and the surface of the licker-in roller 200 is 30 mm. A linear speed of the card wire on the surface of the licker-in roller 200 is 3.14*(0.2+0.003)*2*1440÷60=30.59 m/s. A linear speed of the teeth 7011 on the surface of the saw blade roller 700 is 3.14*(0.16)*2*500±60=8.37 m/s. A ratio of a linear speed of the surface of the licker-in roller 200 to the linear speed of the surface of the saw blade roller 700 is 3.65:1. A preliminary observation and test shows that an impurity-removing amount is more than 50%; a transfer rate of the cotton fiber reaches 100%; the length of the cotton fibers is basically the same; and the processing quality is better than the standard GB/T21308-2007 of the current lint cleaner.

Referring to FIGS. 3-4, the reasons for the effects of the above embodiment are analyzed as follows.

1. Analysis of a Producing Area of the Cotton-Fiber Floating Layer in the Cotton-Brushing Area According to an Air Flow Field Generated During an Operation of the Licker-in Roller 200,

Air quantity Q ₂ =V*S/T*1.4 m;

in which, V is a volume of the licker-in roller 200 suffering from the air; S is a rotation speed; and T is a working time.

The volume of the licker-in roller 200 suffering from the air V₁=[3.14*(0.2+0.003) m*(0.2+0.003) m*1.4 m−3.14*0.2 m*0.2 m*1.4 m]*60%=0.003189 m³.

Air quantity Q ₂=0.003189 m ³*1440/min=4.592 m ³/min=0.0797 m ³ /s.

Therefore, the air quantity generated by the licker-in roller 200 per hour is about 286.9973 m³. A gap between a surface profile of the card wire and the windscreen plate 403 is set to 3 mm, and an area of an air inlet formed by the gap between the surface profile of the card wire and the windscreen plate 403 is 1.4 m*0.003 m=0.0042 m². The air quantity generated by the licker-in roller 200 is 0.0797 m³/s. Theoretically, a wind speed v₁ between the first cover plate 402 and the licker-in roller 200, at the air inlet, and at an air outlet reaches 0.0797÷0.0042=18.981 m/s. An air flow that moves from the air inlet to the air outlet for brushing the cotton fiber is formed. The first cover plate 402 is connected to the third cover plate 409 and the exit channel 406, and the exit channel 406 is under a negative pressure; therefore, when the licker-in roller 200 rotates, the air cannot be exhausted from the exit channel 406 to the saw blade roller 700, and a negative pressure zone will be formed at the saw blade roller 700.

According to the Bernoulli equation, the following equation can be obtained:

P ₁ +ρgh+½ρv ₁ ² =P ₀ +ρgh+½ρv ₀ ².

Referring to FIG. 2, P₁ is a pressure at a left end of the first cover plate 402; P₀ is a pressure outside the third cover plate 409; P₀ is the atmospheric pressure; the air density p=1.293 g/L; v₀ is smaller than v₁; and ΔP=P₀−P₁=−½ρ(v₁ ²−v₀ ²)=232.927−½ρv₀ ²>0. Therefore, a negative pressure is formed between the third cover plate 409 and the saw blade roller 700. The cotton fiber will not suffer from a wind resistance after entering an area covered by the third cover plate 409, and will not be blown into a space between the saw blades 701 but be thrown out. An arc M of the third cover plate 409 covering the surface of the saw blade roller 700 is 62°, which can be used to calculate the number N of rotations of the cotton fiber entering a low-resistance area of the third cover plate 409 and moving to the surface of the licker-in roller 200. N is greater than 62°, and is greater than (M)/(2Πr_(j)). N is the number of rotations that cotton fiber rotates with the centrifugal movement of the saw blade roller 700 until it is thrown on the surface of the licker-in roller 200. The radius of the saw blade roller 700 is r_(j). A relationship between the number N of rotations and the angle M is as shown in the table 5.

TABLE 5 Angle 20° 30° 40° 50° 60° 70° 80° 90° Number of 0.056 0.083 0.111 0.139 0.167 0.194 0.222 0.25 rotations of the cotton fiber Thickness 10.76 16.14 21.52 26.90 32.28 37.66 43.04 48.42 B of the floating layer on the licker-in roller with a diameter of 400 mm and a speed of 1440 rpm Angle 100° 120° 130° 140° 150° Number of 0.278 0.333 0.361 0.389 0.417 rotations of the cotton fiber Thickness 53.80 59.18 64.56 69.94 75.33 B of the floating layer on the licker-in roller with a diameter of 400 mm and a speed of 1440 rpm

2. Analysis of an Impurity-Removing Effect According to an Installation Position of the Impurity-Removing Plate 401

Referring to FIG. 2, an angle between a connection line of an end of the impurity-removing plate 401 close to the saw blade roller 700 and a circle center of the licker-in roller 200 and a connection line of a center of the saw blade roller and a center of the licker-in roller 200 is 40-60°. As shown in the table 5, thicknesses of the cotton-fiber floating layers transferred to the licker-in roller 200 and rotating for 0.111, 0.139 or 0.167 turn to meet the impurity-removing plate 401 are calculated as follows:

${B = {\frac{d_{c}^{2}{\prod{(M)2{\prod{r_{j}w\rho_{s}}}}}}{2{\prod\;{r_{j}*9\mu}}} = \frac{d_{c}^{2}{\prod{(M){w\rho}_{s}}}}{9\mu}}};$

in which w is a rotating speed of the saw blade roller 700; d_(c) is a diameter of the cotton fiber; ρ_(s) is a proportion of the cotton fiber in the cotton-fiber floating layer r; and μ is a fluid viscosity of air; and Π is Pi.

The thicknesses of the cotton-fiber floating layers transferred to the licker-in roller 200 and rotating for 0.111, 0.139 or 0.167 turn are 21 mm, 27 mm and 32 mm, respective. Since the density and diameter of the impurities are much larger than the cotton fiber, thicknesses of impurity floating layers formed by the impurities transferred to the licker-in roller 200 and rotating for 0.111, 0.139, or 0.167 are much greater than those of the cotton-fiber floating layer. When a width of the gap between the impurity-removing plate 401 and the surface of the licker-in roller 200 is 21, 28 or 33 mm, the cotton fiber can be blocked between the impurity-removing plate 401 and the licker-in roller 200, so as to separate the impurity from the cotton fiber. The thickness of the cotton-fiber floating layers is smaller than the width of the gap between the impurity-removing plate 401 and the licker-in roller 200, and the impurity-removing plate 401 does not damage the cotton fiber. Since the density and particle size of the impurity in the cotton fiber are much larger than those of the cotton fiber, when rotating with the licker-in roller 200, the impurity generates a centrifugal thickness greater than the thickness of the cotton-fiber floating layer. The centrifugal thickness of the impurity is larger than the width of the gap between the impurity-removing plate 401 and the licker-in roller 200, such that the impurity can be discharged by the impurity-removing plate 401.

3. Analysis of a Mechanism for the Cotton Fiber to be Transferred from the Saw Blade Roller 700 to the Licker-in Roller 200

As shown in FIG. 4, an end A of a cotton fiber is hooked on the saw blade 701. The cotton fiber moves centripetally along a tangential direction of the saw blade 701. The other end C of the cotton fiber is pulled by a force along a direction of the cotton fiber to follow the A end of the cotton fiber to rotate, such that the cotton fiber is pulled to be straight. A tensile force can be decomposed into a centripetal force F₁ pointing to a circle center O and a component force F₂ parallel to the arc tangent. The C end of the cotton fiber is also subjected to a centrifugal force F₃ and a resistance force in a direction opposite to the centrifugal force. As shown in FIG. 4, an angle between a line of the end C and the end A of the cotton fiber and a tangential direction of the saw blade 701 is β. When the cotton fiber rotates with the saw blade 701, a cotton-fiber floating layer is formed. The cotton-fiber floating layer is partially in contact with a surface of the brush roller 100, and the contact area on the licker-in roller 200 is a cotton-brushing area 414. A length of a chord of the licker-in roller 200 corresponding to the cotton brushing area 414 is S.

As shown in FIG. 3, since the length S of the cotton-brushing area 414 is short, a process of transferring cotton fibers from the saw blade 701 to the licker-in wire layer 408 can be equivalent to transferring the cotton fiber from a linearly-moving object a to a linearly-moving object b. When s is 1, a length of the cotton fiber L_(m) is 28 mm. In an initial state, one end of the cotton fiber is hung at point A of the object a, and the other end is hung at point B of the object b. A maximum distance from the point A to the point B is the length of the cotton fiber. The condition for the complete transfer of the cotton fiber is that the distance from the point B to the point A is greater than the length of the cotton fiber, that is, when leaving from the object a, the cotton fiber is completely straightened. In this way, the end of the cotton fiber far away from the point B of the object can be separated from the point A of the object a. If the separation of the cotton fiber and the point A of the object a is not completed in the cotton brushing area 414, the speed directions of the object a and the object b will change, such that when the object a produces a velocity component in a direction opposite to a traveling direction of the object b, the cotton fiber will be torn off by the object a and the object b, resulting in an incomplete transfer of the cotton fiber, returning flow of the cotton fiber or fiber block. The length S of the cotton brushing area 414 should be greater than 2L_(m)+2h_(s), in which h_(s) is a traveling distance a hanging point of cotton fiber on the saw blade 701 when the hanging point of cotton fiber on the licker-in wire layer 408 catches up with the hanging point of the cotton fiber on the saw blade 701. Therefore, h_(s)/v_(a)≥(h_(s)+L_(m))/v_(b), h_(s)≥L_(m)*v_(a)/(v_(b)−v_(a)); in which v_(b) and v_(a) are tlinear speeds of the licker-in wire layer 408 and the saw blade 701, respectively.

4. Checking Calculation the Characteristics for Transferring the Cotton Fiber

The size of the licker-in roller 200, the size of the saw blade roller 700, and the rotation speed of the saw blade roller 700 in this example are similar to those in Comparative Example 1. An arc of the saw blade roller 700 covered by the third cover plate 409 in this example is 62°. The thickness B of the cotton-fiber floating layer is calculated according to Table 1.

$B = {\frac{d_{c}^{2}{\prod{(M)2{\prod{r_{j}w\rho_{s}}}}}}{2{\prod\;{r_{j}*9\mu}}} = \frac{d_{c}^{2}{\prod{(M)w\rho_{s}}}}{9\mu}}$

A diameter of one cotton fiber: d_(c)=15 μm; a length of one cotton fiber: 28 mm; a volume of one cotton fiber: 3.14*0.015 mm*0.015 mm*28=0.019782 mm³; a specific density ρ_(s) of the cotton fiber: 1.5 g/cm³; at 30° C., μ=0.0186 mPa*s. w is a rotation speed of the saw blade roller 700, and u_(i) is a tangential velocity of a particle and gas in a cyclone separator, and is equivalent to a linear speed of the cotton fiber when the cotton fiber rotates with the saw blade roller 700. u_(i) is equal to 2Πr_(j)w.

Table 5 shows the number of rotations that cotton fiber rotates with the centrifugal movement of the saw blade roller 700 until it is thrown on the surface of the licker-in roller 200, and the number of rotations is 62° in this example. A distance between the surface of the licker-in roller 200 and the surface of the saw blade roller 700 is 0.6 mm. The thickness of the cotton-fiber floating layer on the saw blade roller 700 is 9.13 mm. It can be seen from Table 1 that the corresponding thickness 9.13 mm of the cotton-fiber floating layer is smaller than 21 mm, and the cotton-fiber floating layer will not touch the first cover plate 402. The length S of the common chord of the intersecting area (cotton brushing area 414) of the cotton-fiber floating layer and the licker-in roller 200 is no less than 78.88 mm in Table 2.

${S = {2\sqrt{R_{c}^{2} - \left( \frac{R_{c}^{2} - \left( {r_{j} + B} \right)^{2} + \left( {r_{j} + R_{c} + x} \right)}{2\left( {r_{j} + R_{c} + x} \right)} \right)^{2}}}};$

in which B is a thickness of the initial floating layer; R_(c) is a radius of the licker-in roller 200; r_(j) is a radius of the saw blade roller 700, x is the distance between the surface of the licker-in roller 200 and the surface of the saw blade roller 700. When the length S is 78.88 mm, according to S=78.88 mm=2(h_(s)+εL_(m)), it can be calculated: h_(s)=11.44 mm. In addition, v_(b):v_(a)=3.65>3.45:1, the high line speed ratio makes the cotton fiber always be in a straight state during transfer, reducing the twisting and knotting of cotton fiber. When the arc of the saw blade roller 700 covered by the third cover plate 409 is larger than 62°, the licker-in roller 200 provided herein can completely transfer of the cotton fiber from the saw blade roller 700 at the same rotation speed.

The linear speed of the card wire on the surface of the licker-in roller 200: 3.14*(0.2+0.003)*2*1500÷60=31.87 m/s; and the linear speed of the surface of the licker-in roller 200: 3.14*(0.2)*2*1440÷60=31.4 m/s. That is, the linear speed of the licker-in roller 200 and the line speed of the card wire on the surface of the licker-in roller 200 are both greater than the airflow speed of the air inlet, which is 3.322 m/s. Therefore, the card wire on the surface of the licker-in roller 200 will not vibrate under the high-speed cutting of the airflow, such that the noise will not be generated. In this way, the device provided herein works well in noise reducing.

Example 2

As shown in FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 700 rpm. The licker-in roller 200 has a diameter of 400 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 203 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 1440 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. The upper part of the saw blade roller 700 close to the licker-in roller 200 is provided with a third cover plate 409. A gap between a left end of the third cover plate 409 and the surface of the saw blade roller 700 is 3 mm. A right end of the third cover plate 409 is connected to the first cover plate 402. A distance from the right end of the third cover plate 409 to the surface of the saw blade roller 700 is 21 mm. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 2.57:1.

If an arc length from the left end of the third cover plate 409 to a connection line of a center of the licker-in roller 200 and a center of the saw blade roller 700 is 32°, it can be from Table 1 that a thickness of the corresponding cotton-fiber floating layer is 6.597 mm, which is less than 21 mm. Therefore, the cotton-fiber floating layer will not touch the first cover plate 402. As shown in Table 3, the corresponding chord length S is 68.18 mm. S=68.18 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=3.12>2.57, which means not all of the cotton fiber be pulled away in a straight line in time.

The test results show that a removing amount of the impurity removal is more than 50%. The linear speed ratio is smaller than 3.12, and the cotton fiber is kneaded into knots and cannot be transferred 100%.

Example 3

As shown in FIG. 6, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 390 rpm. The licker-in roller 200 has a diameter of 250 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 128.5 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 2100 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 4.30:1.

In an embodiment, the two side walls of the saw blade roller 700 are respectively provided with a rib 702, and the saw blade roller 700 can hook and pull cotton fibers from between the rib 702 to form a cotton-fiber floating layer.

In this example, when the value of 8 is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 62°, it can be seen in Table 1 that a thickness of the corresponding cotton-fiber floating layers theoretically formed under the action of centrifugal force is 7.12 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the barbed roller. As shown in Table 6-7, the corresponding chord length S is 68.83 mm. S=68.83 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=2.86<4.30 means that all cotton fibers can be pulled away in a straight line in time. When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 62°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51−20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

TABLE 6 Chord (mm) The radius of the licker-in roller The thickness B of the floating layer (mm) (mm) 7.12 7.65 9.13 13.32 13.54 14.31 125 60.70 63.13 69.48 84.94 85.68 88.20 160 64.97 67.58 74.42 91.12 91.92 94.66 180 66.91 69.61 76.66 93.93 94.76 97.59 200 68.60 71.36 78.61 96.36 97.20 100.12 203 68.83 71.61 78.88 96.69 97.54 100.47 220 70.06 72.90 80.30 98.47 99.34 102.33 240 71.36 74.24 81.80 100.33 101.22 104.27 260 72.51 75.44 83.13 101.98 102.89 105.99 310.5 74.92 77.95 85.90 105.44 106.37 109.59

Table 6 shows the supplementary calculation results of the chord S in the intersecting area of the circular cotton-fiber floating layer produced by the rotation of the saw blade roller 700 and the licker-in roller 200.

The linear speed ratio of the licker-in roller 200 to the saw blade roller 700 corresponding to the chord length S above is shown in Table 7.

TABLE 7 The linear speed ratio of the licker-in roller to the saw blade roller The thickness B of the cotton-fiber The radius of the licker-in floating layer (mm) roller (mm) 7.12 7.65 9.13 13.32 13.54 14.31 125 3.82 3.44 2.82 2.12 2.10 2.03 160 3.22 2.97 2.51 1.97 1.95 1.90 180 3.03 2.81 2.41 1.91 1.90 1.85 200 2.88 2.69 2.33 1.87 1.85 1.81 203 2.86 2.67 2.31 1.86 1.85 1.80 220 2.77 2.59 2.26 1.83 1.82 1.78 240 2.69 2.52 2.21 1.81 1.79 1.75 260 2.62 2.46 2.17 1.78 1.77 1.73 310.5 2.49 2.35 2.09 1.74 1.73 1.69

Example 4

Referring to FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 500 rpm. The licker-in roller 200 has a diameter of 400 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 203 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 1040 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 2.639:1.

In this example, when the value of c is 0.8, an arc M between a rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to a surface of the saw blade roller 700 is 52°, it can be seen in Table 1 that a thickness of the cotton-fiber floating layers theoretically formed under the action of centrifugal force of the saw blade roller 700 is 7.65 mm<21 mm, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller. As shown in Table 6-7, the corresponding chord length S is 71.61 mm. S=71.61 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=2.67>2.639 means that all cotton fibers cannot be pulled away in a straight line in time.

If an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 62°, It can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force is 9.13 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 78.88 mm. S=78.88 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=2.31<2.6 means that all cotton fibers can be pulled away in a straight line in time. When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is greater than 62°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

Example 5

Referring to FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 650 rpm. The licker-in roller 200 has a diameter of 400 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 203 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 1365 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 2.664:1.

In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 42°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 8.04 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 73.39 mm. S=73.39 mm=2(h_(s)+0.8L_(m)) and (h_(s)+0.8L_(m))/h_(s)=2.57<2.664 mean that all cotton fibers can be pulled away in a straight line in time.

When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 42°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

Example 6

Referring to FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 675 rpm. The licker-in roller 200 has a diameter of 615 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 310.5 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 618 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 1.776:1.

In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 72°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 14.31 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 109.59 mm. S=109.59 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=1.69<1.776 means that all cotton fibers can be pulled away in a straight line in time.

When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 72°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

Example 7

Referring to FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 780 rpm. The licker-in roller 200 has a diameter of 615 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 310.5 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 730 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 1.816:1.

In this example, when the value of c is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 58°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 13.32 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 105.44 mm. S=105.44 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=1.74<1.816 means that all cotton fibers can be pulled away in a straight line in time.

When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 58°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

Example 8

Referring to FIG. 2, a device for removing an impurity in a cotton fiber is provided. A diameter of the saw blade 701 of the saw blade roller 700 is 320 mm. The saw blade roller 700 has a working length of 1024.25 mm and a rotation speed of 500 rpm. The licker-in roller 200 has a diameter of 615 mm and a working length of 1400 mm. The licker-in wire layer 408 composed of the 109-type card wire and the card clothing is evenly wound on the surface of the shell 407 along the circumference. A wounding spacing of the licker-in wire layer 408 is 2 mm. All card wires are arranged on the surface of the shell 407, and faces to the same direction or are perpendicular to a surface of the licker-in wire layer 408. A height of the card wire is 3 mm, and a radius R₁ of the licker-in wire layer 408 is 310.5 mm. A volume of the card wire occupies 40% of a volume of the licker-in wire layer 408, and a rotation speed of the licker-in roller 200 is 455 rpm. A gap between the surface of the saw blade roller 700 and a surface of the licker-in roller 200 is 0.6 mm. A rotation direction of the licker-in roller 200 is opposite to that of the saw blade roller 700. A gap between the first cover plate 402 and the surface of the licker-in wire layer 408 is 3 mm. A vertical distance between A left end of the first cover plate 402 and a tangent point of the saw blade roller 700 and the licker-in roller 200 is 65 mm, and a right end of the first cover plate 402 of is connected to the windscreen plate. A gap between the windscreen plate and the surface of the licker-in wire layer 408 is 3 mm, and a gap between a left end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 15 mm. A vertical distance between the left end of the impurity-removing plate 401 and the tangent point of the saw blade roller 700 and the licker-in roller 200 is 120 mm. A right end of the impurity-removing plate 401 is connected to the cotton-fiber support plate 404. A gap between the right end of the impurity-removing plate 401 and the surface of the licker-in wire layer 408 is 60 mm. The surface of the cotton-fiber support plate 404 is provided with an air inlet 410. A ratio of a surface linear speed of the licker-in roller 200 to a surface linear speed of the saw blade roller 700 is 1.76:1.

In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 92°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 13.54 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 109.59 mm. S=109.59 mm=2(h_(s)+0.8L_(m)), (h_(s)+0.8L_(m))/h_(s)=1.73<1.76 means that all cotton fibers can be pulled away in a straight line in time.

When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 92°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is L_(m)×sin θ=13.51−20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.

The principle of the high efficiency for the device provided herein to remove the impurity in the cotton fiber is described as follow.

Referring to FIG. 2, the surface of the licker-in roller 200 is provided with the licker-in wire layer 408, which can provide a strong holding force to the cotton fibers. In addition, the licker-in roller 200 and the saw blade roller 700 are arranged in a non-contact manner. During the transfer process, the impurity that has already been exposed on the saw blade roller 700 will not be combined with the cotton fiber again, whereas since the cotton fiber is lighter, thinner, longer and rougher than the impurities, the cotton fiber is easy to be held by the card wire; impurities such as infertile seeds, leaf crumbs, cottonseed hulls, cottonseed covers, are heavy, small, short and smooth, they are not easy to be held by the card wire. Therefore, after being transferred to the licker-in roller 200, the cotton fiber moves forward with the rotation of the licker-in roller 200. Whereas the gripping force of the licker-in roller 200 on the impurity is small, and under the action of the centrifugal force of the licker-in roller 200, the impurity is easy to be thrown out of the cotton fiber layer. The impurity is blocked by the movable impurity-removing plate 401 arranged at the lower part of the licker-in roller 200 and then is discharged out of the device. In this way, the impurity-removing efficiency of the device having the roller with the card wire is more than 50%, which exceeds the impurity-removing efficiency required by the standard GB/T 21208-2007 for the lint cleaning device and the standard GH/T1023-2000 for the linter cleaning device. The device provided herein integrates the saw ginning and lint cleaning, and the saw delinting and linter cleaning.

The embodiments provided herein are not intended to limit the scope of this disclosure, and modifications, replacements and improvements made by those skilled in the art within the spirit of the present disclosure should fall within the scope of the present disclosure defined by the appended claims. When the rotation speed of the saw blade roller 700 is 10 rpm, a ratio of the linear speed of the licker-in roller 200 to the linear speed of the saw blade roller 700 is greater than the values in Table 3, which means the cotton fiber can still be completely transferred. In addition, as shown in Table 3, the thickness of the cotton-fiber floating layer on the surface of the saw blade roller 700 is 13.51-20.84 mm. 

What is claimed is:
 1. A device for transferring a cotton fiber, comprising: a saw blade roller; a licker-in roller; a cotton-fiber support plate which is arc-shaped; a first cover plate; a guide plate; a windscreen plate; and two box plates arranged oppositely; wherein the two box plates are arranged at two ends of the licker-in roller and the saw blade roller, respectively; the first cover plate and the cotton-fiber support plate are arranged between the two box plates from top to bottom; a cylindrical cavity is enclosed by the cotton-fiber support plate and the first cover plate; an arc surface of the cylindrical cavity is provided with a first window and a second window arranged oppositely; the first window is communicated with an exit channel enclosed by the guide plate and the windscreen plate between the two box plates; the licker-in roller is arranged in the cylindrical cavity along an axial direction of the cylindrical cavity; the saw blade roller is arranged in the second window facing away from the exit channel; an axis of the saw blade roller is parallel to an axis of the licker-in roller; a gap between a surface of the saw blade roller and a surface of the licker-in roller is no more than 5 mm; the cotton fiber is capable of rotating with the saw blade roller to form a cotton-fiber floating layer; a linear speed of the licker-in roller is great than a linear speed of the saw blade roller during rotation; and a rotation direction of the saw blade roller is opposite to a rotation speed of the licker-in roller to allow the cotton fiber to be transferred from the saw blade roller to the licker-in roller.
 2. The device of claim 1, wherein the saw blade is provided with a plurality of saw blades; an outer circumference of each of the plurality of saw blades is provided with teeth; two opposite side walls of each of the plurality of saw blades are respectively provided with a rib; the saw blade roller is configured to hook and pull the cotton fiber from between ribs to form an initial floating layer with a thickness of L_(m)×sin t, wherein L_(m) is a length of the cotton fiber; t is an angle between the cotton fiber and a tangent line of the saw blade roller at an intersection of the cotton fiber and the saw blade roller; t=θ=40±4°; and θ is an angle between an entrance side of the teeth of the saw blade roller and a normal plane of the teeth passing through a top of the teeth.
 3. The device of claim 2, wherein a licker-in wire layer is evenly wound on an outer circumference of the licker-in roller; a gap between the first cover plate and the licker-in wire layer is no larger than 5 mm; and a gap between the windscreen plate and the licker-in wire layer is no larger than 5 mm.
 4. The device of claim 3, wherein an end of the first cover plate close to the saw blade roller is a starting end; a distance from the starting end to the saw blade roller is larger than the thickness of the initial floating layer; a distance from the starting end to a line connecting a center of the saw blade roller to a center of the licker-in roller is larger than half of a length S of a chord shared by a virtual circumference of the initial floating layer and a circumference of the licker-in roller; a ratio of the linear speed of the licker-in roller to the linear speed of the saw blade roller is no less than $\frac{S}{S - {2ɛL_{m}}},$ wherein ε is an inclination coefficient of the cotton fiber, and selected from 0.8-1.
 5. The device of claim 2, wherein an arc M of the surface of the saw blade roller between the rib of the saw blade roller and an end of the first cover plate close to the saw blade roller is 42-180°.
 6. The device of claim 2, wherein the saw blade roller is provided with a plurality of second cover plates spaced apart; an end of each of the plurality of second cover plates is connected to the first cover plate; an arc M of the surface of the saw blade roller covered by each of the plurality of second cover plates is 42-180°; a distance between an end of each of the plurality of second cover plates close to the first cover plate and the surface of the saw blade roller is larger than 21 mm; and a distance between an end of each of the plurality of second cover plates away from the first cover plate and the surface of the saw blade roller is 3-10 mm.
 7. The device of claim 6, wherein the number N of rotations of the cotton fiber rotating with the saw blade roller under the plurality of second cover plates is larger than (M)/(2Πr_(j)); r_(j) is a radius of the saw blade roller; a thickness B of the cotton-fiber floating layer is calculated according to a critical diameter formula of a cyclone separator as follows: ${B = {\frac{d_{c}^{2}{\prod{(M)2{\prod{r_{j}w\;\rho_{s}}}}}}{2{\prod{r_{j}*9\mu}}} = \frac{d_{c}^{2}{\prod{(M)w\;\rho_{s}}}}{9\mu}}};$ wherein w is a rotating speed of the saw blade roller; d_(c) is a diameter of the cotton fiber; ρ_(s) is a proportion of the cotton fiber in the cotton-fiber floating layer; and μ, is a fluid viscosity of air; and Π is Pi.
 8. The device of claim 6, wherein a length S of a chord of the saw blade roller intersecting with the initial floating layer or the cotton-fiber floating layer under the plurality of second cover plates is calculated as follows: ${S = {2\sqrt{R_{c}^{2} - \left( \frac{R_{c}^{2} - \left( {r_{j} + B} \right)^{2} + \left( {r_{j} + R_{c} + x} \right)}{2\left( {r_{j} + R_{c} + x} \right)} \right)^{2}}}};$ wherein B is a thickness of the initial floating layer, R_(c) is a radius of the licker-in roller; r_(j) is the radius of the saw blade roller; and x is a distance between the surface of the saw blade roller and the surface of the licker-in roller.
 9. A device for removing an impurity in a cotton-fiber, comprising the device of claim 8; and an impurity-removing plate; wherein the impurity-removing plate is arranged on a side of the cotton-fiber support plate close to the saw blade roller; the impurity-removing plate is detachably connected to the two box plates; the licker-in roller is capable of rotating with respect to the first cover plate to form a low pressure zone on a side of the plurality of second cover plates, so as to reduce an air resistance to the cotton fiber when the cotton fiber rotates centrifugally with the saw blade roller in the low pressure zone.
 10. The device of claim 9, wherein the cotton-fiber support plate is provided with an air compensation port.
 11. The device of claim 9, wherein an angle between a line connecting an end of the impurity-removing plate close to the saw blade roller to a center of the licker-in roller and a line connecting the center of the licker-in roller to a center of the saw blade roller is 20-60°; and a distance between an upper end of the impurity-removing plate and the licker-in roller is 15-45 mm.
 12. A method for transferring a cotton fiber using the device of claim 4, comprising: rotating the saw blade roller to drive a cotton fiber with an impurity to rotate for N circles to form a cotton-fiber floating layer with a thickness of B; rotating the licker-in roller to remove the impurity from a surface of the cotton fiber in the cotton-fiber floating layer hooked by the licker-in layer or the teeth through an impurity-removing plate; and discharging the impurity and a processed cotton fiber through the exit channel; wherein a cotton-brushing area with a length of S is formed on the licker-in roller intersecting with the cotton-fiber floating layer; the ratio of the linear speed of the licker-in roller to the linear speed of the saw blade roller is no less than $\frac{S}{S - {2ɛL_{m}}};$ L_(m) is a length of the cotton fiber; S is larger than 2εL_(m); and ε is the inclination coefficient of the cotton fiber, and is selected from 0.8-1. 